21214052561066 has 4 divisors (see below), whose sum is σ = 31821078841602. Its totient is φ = 10607026280532.

The previous prime is 21214052561063. The next prime is 21214052561071. The reversal of 21214052561066 is 66016525041212.

It is a semiprime because it is the product of two primes.

It can be written as a sum of positive squares in only one way, i.e., 13158792525025 + 8055260036041 = 3627505^2 + 2838179^2 .

It is not an unprimeable number, because it can be changed into a prime (21214052561063) by changing a digit.

It is a pernicious number, because its binary representation contains a prime number (17) of ones.

It is a polite number, since it can be written as a sum of consecutive naturals, namely, 5303513140265 + ... + 5303513140268.

Almost surely, 2^{21214052561066} is an apocalyptic number.

21214052561066 is a deficient number, since it is larger than the sum of its proper divisors (10607026280536).

21214052561066 is a wasteful number, since it uses less digits than its factorization.

21214052561066 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 10607026280535.

The product of its (nonzero) digits is 172800, while the sum is 41.

The spelling of 21214052561066 in words is "twenty-one trillion, two hundred fourteen billion, fifty-two million, five hundred sixty-one thousand, sixty-six".